"Elections are won by men and women chiefly because most people vote against somebody rather than for somebody." - Franklin P. Adams, American journalist and humorist, 1881-1960.
"Politics, as a practice, whatever its professions, has always been the systematic organization of hatreds." - Henry Brook Adams, American man of letters, 1838-1918.
I'm not quite sure what a 'man of letters' is, but who am I to argue with the Oxford Dictionary of Quotations?